Temporal.PlainDateTime.prototype.inLeapYear
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The inLeapYear accessor property of Temporal.PlainDateTime instances returns a boolean indicating whether this date is in a leap year. A leap year is a year that has more days (due to a leap day or leap month) than a common year. It is calendar-dependent.
The set accessor of inLeapYear is undefined. You cannot change this property directly.
For general information and more examples, see Temporal.PlainDate.prototype.inLeapYear.
Examples
Using inLeapYear
js
const dt = Temporal.PlainDateTime.from("2021-07-01");
console.log(dt.inLeapYear); // false
console.log(dt.daysInYear); // 365
console.log(dt.monthsInYear); // 12
Specifications
| Specification |
|---|
| Temporal proposal # sec-get-temporal.plaindatetime.prototype.inleapyear |
Browser compatibility
BCD tables only load in the browser
See also
Temporal.PlainDateTimeTemporal.PlainDateTime.prototype.with()Temporal.PlainDateTime.prototype.add()Temporal.PlainDateTime.prototype.subtract()Temporal.PlainDateTime.prototype.yearTemporal.PlainDateTime.prototype.daysInYearTemporal.PlainDateTime.prototype.monthsInYearTemporal.PlainDate.prototype.inLeapYear